Primitive central idempotents of a finite group over a field

Abstract

We give a method to compute the primitive central idempotents of a semi-simple finite group algebra associated with an irreducible character $χ$ such that for every $g\in G$, either $χ(g) = 0$ or all eigenvalues of $ρ(g)$ have the same order. We then show several consequences which highlight the significance and possible applications of our approach.